Looking for old Thread!Can't run more than a mile ?

Don't post much and am interested to find a thread that was on here a while back that went along the lines of a ultra runner that now had trouble running more than a few miles before having to walk.Was an interesting read and would like to find it.Also am not sure if it would have got deleted after the change to the new format.Not sure what forum it was actually in.Thanks for any help.

From what I remember it was more along the lines of lack of blood flow in the legs.And this was coming from it sounded like a pretty quick and experienced Ultrarunner. Like AT-Runner said ,a lot was lost in the changeover and I have been trying to search through all the previous posts to no avail.